Draft: Change CMake dependencies: DecayTreeFitter is renamed DecayTreeFitterLib

Change what DecayTreeTuple links to. Depends on Phys!970 (merged).

This MR will no longer be needed (nor can be merged) once !828 (merged) is merged.

Phys/DecayTreeTuple/CMakeLists.txt

@@ -66,7 +66,7 @@ gaudi_add_module(DecayTreeTuple
         Phys::DaVinciInterfacesLib
         Phys::DaVinciKernelLib
         Phys::DaVinciMCKernelLib
-        Phys::DecayTreeFitter
+        Phys::DecayTreeFitterLib
         Phys::LoKiLib
         Phys::LoKiPhysLib
         Phys::LoKiUtils